package com.hello.sandbox.calc.core;

import android.text.TextUtils;

public class ConvertUpMoney {
  //大写数字
  private static final String[] NUMBERS = {"零", "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖"};
  // 整数部分的单位
  private static final String[] IUNIT = {"元", "拾", "佰", "仟", "万", "拾", "佰", "仟", "亿", "拾", "佰", "仟", "万", "拾", "佰", "仟"};
  //小数部分的单位
  private static final String[] DUNIT = {"角", "分", "厘"};

  //转成中文的大写金额
  public static String toChinese(String str) {
    //判断输入的金额字符串是否符合要求
    if (TextUtils.isEmpty(str) || !str.matches("(-)?[\\d]*(.)?[\\d]*")) {
      return str;
    }

    if ("0".equals(str) || "0.00".equals(str) || "0.0".equals(str)) {
      return "零元";
    }

    //判断是否存在负号"-"
    boolean flag = false;
    if (str.startsWith("-")) {
      flag = true;
      str = str.replaceAll("-", "");
    }

    str = str.replaceAll(",", "");//去掉","
    String integerStr;//整数部分数字
    String decimalStr;//小数部分数字


    //初始化：分离整数部分和小数部分
    if (str.indexOf(".") > 0) {
      integerStr = str.substring(0, str.indexOf("."));
      decimalStr = str.substring(str.indexOf(".") + 1);
    } else if (str.indexOf(".") == 0) {
      integerStr = "";
      decimalStr = str.substring(1);
    } else {
      integerStr = str;
      decimalStr = "";
    }

    //beyond超出计算能力，直接返回
    if (integerStr.length() > IUNIT.length) {
      return "超出计算能力";
    }

    int[] integers = toIntArray(integerStr);//整数部分数字
    //判断整数部分是否存在输入012的情况
    if (integers.length > 1 && integers[0] == 0) {
      if (flag) {
        str = "-" + str;
      }
      return str;
    }
    boolean isWan = isWan5(integerStr);//设置万单位
    int[] decimals = toIntArray(decimalStr);//小数部分数字
    String result = getChineseInteger(integers, isWan) + getChineseDecimal(decimals);//返回最终的大写金额
    if (flag) {
      return "负" + result;//如果是负数，加上"负"
    } else {
      return result;
    }
  }

  //将字符串转为int数组
  private static int[] toIntArray(String number) {
    int[] array = new int[number.length()];
    for (int i = 0; i < number.length(); i++) {
      array[i] = Integer.parseInt(number.substring(i, i + 1));
    }
    return array;
  }

  //将整数部分转为大写的金额
  public static String getChineseInteger(int[] integers, boolean isWan) {
    StringBuffer chineseInteger = new StringBuffer("");
    int length = integers.length;
    if (length == 1 && integers[0] == 0) {
      return "";
    }
    for (int i = 0; i < length; i++) {
      String key = "";
      if (integers[i] == 0) {
        if ((length - i) == 13)//万（亿）
          key = IUNIT[4];
        else if ((length - i) == 9) {//亿
          key = IUNIT[8];
        } else if ((length - i) == 5 && isWan) {//万
          key = IUNIT[4];
        } else if ((length - i) == 1) {//元
          key = IUNIT[0];
        }
        if ((length - i) > 1 && integers[i + 1] != 0) {
          key += NUMBERS[0];
        }
      }
      chineseInteger.append(integers[i] == 0 ? key : (NUMBERS[integers[i]] + IUNIT[length - i - 1]));
    }
    return chineseInteger.toString();
  }

  //将小数部分转为大写的金额
  private static String getChineseDecimal(int[] decimals) {
    StringBuffer chineseDecimal = new StringBuffer("");
    for (int i = 0; i < decimals.length; i++) {
      if (i == 3) {
        break;
      }
      chineseDecimal.append(decimals[i] == 0 ? "" : (NUMBERS[decimals[i]] + DUNIT[i]));
    }
    return chineseDecimal.toString();
  }

  //判断当前整数部分是否已经是达到【万】
  private static boolean isWan5(String integerStr) {
    int length = integerStr.length();
    if (length > 4) {
      String subInteger = "";
      if (length > 8) {
        subInteger = integerStr.substring(length - 8, length - 4);
      } else {
        subInteger = integerStr.substring(0, length - 4);
      }
      return Integer.parseInt(subInteger) > 0;
    } else {
      return false;
    }
  }

}
